|Publication number||US7834559 B2|
|Application number||US 11/354,838|
|Publication date||Nov 16, 2010|
|Filing date||Feb 16, 2006|
|Priority date||Feb 16, 2006|
|Also published as||US20070190890|
|Publication number||11354838, 354838, US 7834559 B2, US 7834559B2, US-B2-7834559, US7834559 B2, US7834559B2|
|Inventors||Cheng-Chia Hsu, Yu-Cheng Pan|
|Original Assignee||Logah Technology Corp.|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (14), Referenced by (2), Classifications (10), Legal Events (4)|
|External Links: USPTO, USPTO Assignment, Espacenet|
1. Field of the Invention
The present invention relates to an improved lamp circuit of a liquid crystal device (LCD) backlight source, particularly to a lamp circuit of a LCD backlight source.
2. Description of the Prior Art
Therefore, there is still some problems to be addressed with respect to the prior lamp circuit of LCD backlight source. In view of these problems, the Inventors have paid an effort in the related research and finally developed successfully an inventive lamp circuit of LCD backlight source.
It is, therefore, an object of the present invention to provide an improved lamp circuit of liquid crystal device (LCD) backlight source having connectors and high voltage wires whose number may be reduced and cost therefore may be thus lowered.
It is another object of the present invention to provide a LCD backlight source having a printed circuit board (PCB) for lamp initialization whose volume may be reduced, leading to a decreased cost and easy installation.
It is yet another object of the present invention to provide an improved lamp circuit of liquid crystal device (LCD) backlight source providing the advantages of enhanced stability, prolonged lifetime, reduced cost and saved arrangement space.
In accordance with the present invention, the improved lamp circuit of LCD backlight source comprises a printed circuit board (PCB) for lamp initialization having a control circuit and a first connector thereon; a first lamp connection board disposed between the first lamp connection board and a second lamp connection board and being lamps of the LCD backlight source; a second lamp connection board having a second connector and transformers thereon, the transformers each corresponding to one of the lamps; and a low voltage wire set connected between the first connector on the PCB for lamp initialization and the second connector on the second lamp connection board, wherein a signal issued from the first connector on the PCB for lamp initialization is transmitted through the low voltage wire set to the second connector on the first PCB for lamp initialization and then to a corresponding one of the transformers so that the lamps may be driven to operate.
With use of the present invention, number of the used connectors may be reduced and arrangement issue of the high voltage wires may be obviated, making volume of the PCB for lamp initialization allowed to be reduced and cost of the lamp circuit lowered.
The drawings disclose illustrative embodiments of the present invention which serve to exemplify the various advantages and objects hereof, and are as follows:
The PCB for lamp initialization 21 has a control circuit 211 and a first connector 212. The control lines 211 may be an integrated circuit for pulse width modulation (PWMIC) or a microprocessor.
The first lamp connection board 22 is connected between the first and second lamp connection boards 22, 23 and is lamps 24 of the LCD backlight source. Alternatively, the first lamp connection board 22 may be replaced with connection wires.
The second lamp connection board 23 has a second connector 231 and transformers 232 thereon, the transformers 232 each corresponding to one of the lamps 24.
The low voltage wire set 25 is connected between the first connector 212 on the PCB for lamp initialization 21 and the second connector 231 on the second lamp connection board 23.
With the above components and arrangement, the control circuit of the PCB for lamp initialization 21 issues one or more control signal and the control signal is transmitted to the second connector 231 on the first lamp connection board 22 through the low voltage wire set 25. Then, each of the control signals is outputted to the respective transformer 232 from the second connector 231 so as to drive the lamps 24 to operate.
As compared to the prior art, the improved lamp circuit of LCD backlight source provides the following advantages: 1. Number of the connector and high voltage wires may be reduced to lower cost of the lamp circuit. 2. Volume of the PCB for control of the lamps may be reduced to lower cost of the lamp circuit and thus the PCB is easy to be installed. 3. The lamp circuit has promoted stability, prolonged lifetime, reduced cost and saved arrangement space.
Many changes and modifications in the above described embodiments of the invention can, of course, be carried out without departing from the scope thereof. Accordingly, the disclosed embodiments are not intended to be deemed in a limiting sense and the scope of the invention should be construed only by the scope of the appended claims.
|Cited Patent||Filing date||Publication date||Applicant||Title|
|US7411357 *||Dec 3, 2004||Aug 12, 2008||Samsung Electronics Co., Ltd.||Liquid crystal and device of driving light source therefor|
|US20050007333 *||Jun 29, 2004||Jan 13, 2005||Han Seung Jun||Backlight driving circuit|
|US20050078080 *||Aug 11, 2004||Apr 14, 2005||Seock-Hwan Kang||Method and apparatus for controlling operation of lamps|
|US20050134199 *||Dec 7, 2004||Jun 23, 2005||Minebea Co., Ltd.||Discharge lamp driving circuit provided with discharge detecting pattern|
|US20050253537 *||May 9, 2005||Nov 17, 2005||Hyeon-Yong Jang||Backlight assembly, display device and driving apparatus of light source for display device|
|US20050269976 *||Aug 5, 2005||Dec 8, 2005||Zippy Technology Corp.||LCD back light panel lamp connecting structure|
|US20060001385 *||Jun 15, 2005||Jan 5, 2006||Lg.Philips Lcd Co., Ltd.||Apparatus for driving lamp of liquid crystal display device|
|US20060023471 *||Jun 30, 2005||Feb 2, 2006||Ahn In H||Backlight unit|
|US20060043910 *||Aug 26, 2004||Mar 2, 2006||Chun-Kong Chan||Modularized inverter control circuit|
|US20060061305 *||Jun 29, 2005||Mar 23, 2006||Lg. Philips Lcd Co., Ltd.||Backlight unit and method for driving the same|
|US20060139013 *||Nov 28, 2003||Jun 29, 2006||Hyeong-Suk Yoo||Power supply apparatus, backlight assembly and liquid crystal display apparatus having the same|
|US20060220593 *||Mar 31, 2005||Oct 5, 2006||Ball Newton E||Nested balancing topology for balancing current among multiple lamps|
|US20060238987 *||Feb 10, 2006||Oct 26, 2006||Samsung Electronics Co., Ltd.||Power supply device, backlight assembly and display apparatus having the same|
|US20060279232 *||May 9, 2006||Dec 14, 2006||Sony Corporation||Discharge tube lighting apparatus, light source apparatus, and display apparatus|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US8018180 *||Jul 27, 2009||Sep 13, 2011||Au Optronics Corp.||Backlight module for LCD device|
|US20100283402 *||Jul 27, 2009||Nov 11, 2010||Tsung-Shiun Lee||Backlight module for lcd device|
|U.S. Classification||315/277, 315/282, 315/312|
|Cooperative Classification||H05K1/14, H05K1/145, G02F1/133604, H05B41/245, G02F2001/133612|
|Feb 16, 2006||AS||Assignment|
Owner name: LOGAH TECHNOLOGY CORP., TAIWAN
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:HSU, CHENG-CHIA;PAN, YU-CHENG;REEL/FRAME:017598/0104
Effective date: 20060213
|Jun 27, 2014||REMI||Maintenance fee reminder mailed|
|Nov 16, 2014||LAPS||Lapse for failure to pay maintenance fees|
|Jan 6, 2015||FP||Expired due to failure to pay maintenance fee|
Effective date: 20141116